It has been a rough week for privacy-focused web browser Tor, or The Onion Router. Its underlying software was affected by browser malware, and cybercriminals were found to be hiding ransomware on the Tor network. On Tuesday, the Tor mailing list reported the existence of a zero-day Firefox exploit that had been seen in the wild. Since the Tor browser is built upon Firefox, any problem with Firefox is a problem for Tor.